/**
 * @Title: ModelAndViewController.java
 * @Package com.camelot.cmis.login.controller
 * Copyright: Copyright (c) 2013
 * Company:北京柯莱特科技有限公司
 * @author Comsys-dengzongyu
 * @date 2013-12-19 下午4:30:26
 * @version V1.0
 */

package com.camelot.ccr.login.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * <pre>
 * 生成验证码
 * </pre>
 * @author Liu Jun
 * @version V0.1, 2013-12-31 上午11:19:14
 */
@Controller
@RequestMapping("/login")
public class RandViewController{
	/**
	 * 生成随机验证码
	 * @param request request
	 * @param response response
	 * @throws Exception 异常
	 */
	private void CreateImageCode(HttpServletRequest request,HttpServletResponse response) 
		throws Exception {
		// 设置页面不缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		// 在内存中创建图象
		int width = 60, height = 20;
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);
		// 获取图形上下文
		Graphics g = image.getGraphics();
		// 生成随机类
		Random random = new Random();
		// 设定背景色
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		// 设定字体
		g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
		// 画边框
		// g.setColor(new Color());
		// g.drawRect(0,0,width-1,height-1);
		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 150; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}
		// 取随机产生的认证码(4位数字)
		String sRand = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			sRand += rand;
			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			g.drawString(rand, 13 * i + 6, 16);
		}
		// 将认证码存入SESSION
		request.getSession().removeAttribute("rand");
		request.getSession().setAttribute("rand", sRand);
		// 图象生效
		g.dispose();
		OutputStream out = response.getOutputStream();
		// 输出图象到页面
		ImageIO.write(image, "JPEG", out);
		out.close();
	}

	/**
	 * <pre>
	 * 随机生成颜色
	 * </pre>
	 * @param fc fc
	 * @param bc bc
	 * @return Color
	 * @author Liu Jun, 2013-12-31 上午11:20:21
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		int fcc = fc;
		int bcc = bc;
		if (fcc > 255){
			fcc = 255;
		}
		if (bcc > 255){
			bcc = 255;
		}
		int r = fcc + random.nextInt(bcc - fcc);
		int g = fcc + random.nextInt(bcc - fcc);
		int b = fcc + random.nextInt(bcc - fcc);
		return new Color(r, g, b);
	}
	/**
	 * <pre>
	 * 生成验证码
	 * </pre>
	 * @param request request
	 * @param response response
	 * @throws Exception 异常
	 * @author Liu Jun, 2013-12-31 上午11:22:17
	 */
	@RequestMapping("/randView")
	public void handleRequest(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		CreateImageCode(request, response);
	}

}
